RR custom landing page

Create a custom landing for the Research Professional tenant at https://researchprofessional.oaeproject.org.

It should have exactly the same layout as the Fold tenant, but with the following colors:

(turquoise) - #006B91
(maroon) - #76394E
(navy blue) - #1D386E
(moss green) - #728653

The text and a draft of how this should look like has been shared with @bp323 through the production environment.

I know @mrvisser is sitting in a corner somewhere saying "I told you so", but this one might be worth it given the number of people from institutions around the world that will have access to it. Yes, post-rationalisation :).